umap.plot.connectivity issue with plotting colours for categories

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Hello,

I am having some trouble plotting a umap with different colours for categories. I am using the umap.plot.connectivity as I am plotting with hammer for edge bundling:

My code to generate the plot is as follows:

`meta = pd.read_csv("metadata.csv")

mapper = umap.UMAP().fit(counts.transpose())

##plot points
x=umap.plot.points(mapper, labels=meta["Organ"])

**please note plot.points DOES colour all organs appropriately**

**not when i plot connectivity**

##with connectivity

umap.plot.connectivity(mapper, edge_bundling="hammer",
cmap="rainbow", )`

This produces the plot attached to this post

[hammer distance.pdf](https://github.com/lmcinnes/umap/files/4234951/hammer.distance.pdf)

I have different combinations of patterns in the arguments including edge_cmap, show_points, color_key and color_key_cmap with no success!

Any help would be much appreciated!!

Additionally, are there ways of further customising the plot, add title, remove borders etc.. I am having trouble passing this object to matplotlib arguments downstream of this.

many thanks!

Start by reproducing the shown Python example with umap.plot.points and umap.plot.connectivity, including edge_bundling="hammer", and compare how category colours are applied. Check whether the connectivity plot exposes the matplotlib customisation requested; done means category colours remain consistent and the resulting plot can be customised as described.

Written by the indexing model from the issue text.